Klaus Aehlig Florian Haftmann Tobias Nipkow A Compiled Implementation of Normalization by Evaluation. 39-54 2008 TPHOLs http://dx.doi.org/10.1007/978-3-540-71067-7_8 conf/tphol/2008 db/conf/tphol/tphol2008.html#AehligHN08